[clang] [clang] Fix compile-time regression from attribute arg checking change (PR #101768)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

The code changes LGTM but I wonder if we should put a branch up on https://llvm-compile-time-tracker.com/ to verify the compile-time improvements before landing to verify they in fact resolve the issue.

https://github.com/llvm/llvm-project/pull/101768